Method 1: Using a computer.

Step 1: download the APK onto your computer

Step 2: Open SideQuest and make sure developer mode is turned on. (Download the advanced version if you don't have it.)

Step 3: Plug your headset into your computer using a cable.

Step 4: Click the, "Install APK file from folder on computer" button (The box with the arrow pointing down.).

Step 5: Search for, "Operation Orangutan.apk" on your computer and double click on it.

Step 6: Wait for the app to download and install.

Step 7: Unplug your headset after install.

Step 8: Put on your headset, go to your apps, and near the top right, click the drop-down button and click, "Unknown Sources".

Step 9: Have fun playing!

Method 2: Using Standalone. (May not work due to recent quest updates.)

Step 1: Go to https://kanz1.itch.io/operation-orangutan in your Meta Quest Browser.

Step 2: Download Operation Orangutan.

Step 3: Go to your Meta Quest Store and download Mobile VR Station.

Step 4: After Operation Orangutan and Mobile VR Station is installed, open Mobile VR Station.

Step 5: Watch the tutorial video below to install Operation Orangutan.

(P.S. When you get to, "Step 1: Request access" in the tutorial, on the top left, your text may not say, "Standalone HMD". The text you see on the top left means the same thing. Sorry if he is a bit loud.)

Step 6: After you have completed the tutorial, Operation Orangutan will be in your Unknown Sources tab in your apps menu.

Step 7: Have fun playing!